The VIM global command can select the lines that match a certain pattern in the scope of whole file. And the appened commands can operate on the selected lines.

Either the following command can be used to remove the empty lines.

:g/^\(\t\|\s\)*$/d

:v/\S/d

The command ':v' is similar to the command 'grep -v' which select the inverted matched lines.

\S is the meta character for the characters which is not white space or tab.

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